Beer-Lambert Law Calculator: Absorbance & Concentration

Calculate Absorbance or Concentration

L mol⁻¹ cm⁻¹
cm

Instructions: Fill in the Molar Absorptivity and Path Length above. Then, enter a value for either Absorbance or Concentration below to calculate the other.

mol L⁻¹ (M)

Results:

Calculated Absorbance (A):

Calculated Concentration (c):

Unlock the power of quantitative analysis with our Beer-Lambert Law Calculator. Easily determine the absorbance of a solution given its concentration, molar absorptivity, and path length, or find the concentration from absorbance readings. Essential for chemistry, biology, and biochemistry students and professionals in spectrophotometry.

Formula:

The Beer-Lambert Law describes the relationship between the absorbance of a solution and its properties:

A = εbc

  • A: Absorbance (unitless)
  • ε: Molar Absorptivity (also Extinction Coefficient), typically in L mol-1 cm-1
  • b: Path Length of the light through the sample, typically in cm
  • c: Concentration of the absorbing species, typically in mol L-1 (M)

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